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Methods of well stimulation and completion

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US20050145385A1
US20050145385A1 US10751593 US75159304A US2005145385A1 US 20050145385 A1 US20050145385 A1 US 20050145385A1 US 10751593 US10751593 US 10751593 US 75159304 A US75159304 A US 75159304A US 2005145385 A1 US2005145385 A1 US 2005145385A1
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Prior art keywords
resin
well
bore
agent
formation
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Abandoned
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US10751593
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Philip Nguyen
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Halliburton Energy Services Inc
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Halliburton Energy Services Inc
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; MISCELLANEOUS COMPOSITIONS; MISCELLANEOUS APPLICATIONS OF MATERIALS
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60Compositions for stimulating production by acting on the underground formation
    • C09K8/80Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
    • C09K8/805Coated proppants
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; MISCELLANEOUS COMPOSITIONS; MISCELLANEOUS APPLICATIONS OF MATERIALS
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60Compositions for stimulating production by acting on the underground formation
    • C09K8/62Compositions for forming crevices or fractures
    • C09K8/66Compositions based on water or polar solvents
    • C09K8/68Compositions based on water or polar solvents containing organic compounds
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; MISCELLANEOUS COMPOSITIONS; MISCELLANEOUS APPLICATIONS OF MATERIALS
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60Compositions for stimulating production by acting on the underground formation
    • C09K8/62Compositions for forming crevices or fractures
    • C09K8/66Compositions based on water or polar solvents
    • C09K8/68Compositions based on water or polar solvents containing organic compounds
    • C09K8/685Compositions based on water or polar solvents containing organic compounds containing cross-linking agents

Abstract

The present invention relates to improved methods for well stimulation and completion. More particularly, the present invention relates to methods of stimulating and completing well bores while controlling formation sand migration and proppant flowback. One embodiment of the present invention provides a method of stimulating a formation surrounding a well bore comprising the steps of: (a) hydraulically fracturing a formation to create or enhance at least one fracture; (b) placing proppant coated with a tackifying agent into the far-well bore area of the fracture; and, (c) placing an agent capable of controlling particulate flowback into the well bore or near-well bore area of the fracture.

Description

    BACKGROUND OF THE INVENTION
  • [0001]
    The present invention relates to improved methods for well stimulation and completion. More particularly, the present invention relates to methods of stimulating and completing well bores while controlling formation sand migration and proppant flowback.
  • [0002]
    A subterranean formation may be treated to increase its permeability by hydraulically fracturing the formation to create or enhance one or more cracks or “fractures.” Such hydraulic fracturing is usually accomplished by injecting a viscous fracturing fluid into the subterranean formation at a rate and pressure sufficient to cause the formation to break down and produce one or more fractures or enhance one or more natural fractures. The fracture or fractures may be horizontal or vertical, with the latter usually predominating, and with the tendency toward vertical fractures increasing with the depth of the formation being fractured. The fracturing fluid is generally a highly viscous gel, emulsion, or foam that comprises a particulate material often referred to as proppant. In some fracturing operations, commonly known as “water fracturing” operations, the fracturing fluid viscosity is somewhat lowered and yet the proppant remains in suspension because the fracturing fluid is injected into the formation at a substantially higher velocity. Whether a highly viscous fluid is used or a less viscous fluid with a higher velocity, proppant is deposited in the fracture and functions, inter alia, to hold the fracture open while maintaining channels through which produced fluids can flow upon completion of the fracturing treatment.
  • [0003]
    To prevent the subsequent flowback of proppant and other unconsolidated particulates with the produced fluids, a portion of the proppant introduced into the fractures may be coated with a hardenable resin composition. When the fracturing fluid, which is the carrier fluid for the proppant, reverts to a thin fluid, the resin-coated proppant is deposited in the fracture, and the fracture closes on the proppant. Such partially closed fractures apply pressure on the resin-coated proppant particles, causing the particles to be forced into contact with each other while the resin composition hardens. The hardening of the resin composition under pressure brings about the consolidation of the resin-coated proppant particles into a substantially hard permeable mass having compressive and tensile strength that hopefully prevents unconsolidated proppant and formation sand from flowing out of the fractures with produced fluids.
  • [0004]
    Another method of preventing the flowback of proppant and other unconsolidated particulates involves the use of screen assemblies. Some of the early screen technology dictated that the screens had to be small enough to pass through the smallest diameter of the well bore on the way to its desired placement location where the diameter of the well bore may actually be larger. Developments in technology have lead to expandable screens such that a relatively small size or small diameter screen may be placed in a desired location along the well bore and then expanded to accommodate the actual size of the well bore at the point of placement. Flowback of the proppant or formation fines with formation fluids is undesirable as it may erode metal equipment, plug piping and vessels, and cause damage to valves, instruments, and other production equipment.
  • [0005]
    While the hydraulic fracturing techniques discussed above are commonly used on vertical well bores, they have not been widely used to stimulate horizontal well bores, particularly those penetrating hard rock formations such as sandstone, due, inter alia, to the fact that such formations usually require high fracturing pressures and result in complex and potentially unstable fracture geometries. The geometry of fractures caused by hydraulic pressure in horizontal well bores is primarily dependent on the formation in situ stresses. In situ stresses may be thought of as occurring in three orthogonal planes: vertical stress, maximum horizontal stress, and minimum horizontal stress. When subjected to hydraulic pressure, fractures, regardless of origin, attempt to propagate in planes orthogonal to the minimum horizontal stress. Thus, fracture configuration resulting from hydraulic pressure can depend on the orientation of the well bore with respect to the minimum horizontal stress. Two such configurations have been the subject on interest in the art: longitudinal fractures that propagate in plane parallel to the well bore axis that are formed when a horizontal well bore is drilled parallel to the maximum horizontal stress (as depicted in FIG. 1); and, transverse fractures that propagate in planes orthogonal to the well bore axis that are formed when a horizontal well bore is drilled perpendicular to the maximum horizontal stress (as depicted in FIG. 2). In such formations, it is often necessary to puncture the formation to direct the fracture geometry.
  • [0006]
    The term “vertical well bore” as used herein refers to a well bore or portion of a well bore that is substantially vertical or deviated from vertical in an amount up to about 30°. The term “horizontal well bore” as used herein refers to a well bore or portion of a well bore that is substantially horizontal or at an angle from vertical in the range of from about 70° to about 90° or more. The term “highly deviated well bore” as used herein refers to a well bore or portion of a well bore that is angled from about 30° to about 70° from vertical.
  • SUMMARY OF THE INVENTION
  • [0007]
    The present invention relates to improved methods for well stimulation and completion. More particularly, the present invention relates to methods of stimulating and completing well bores while controlling formation sand migration and proppant flowback.
  • [0008]
    One embodiment of the present invention provides a method of stimulating a formation surrounding a well bore comprising the steps of: (a) hydraulically fracturing a formation to create or enhance at least one fracture; (b) placing proppant coated with a tackifying agent into the far-well bore area of the fracture; and, (c) placing an agent capable of controlling particulate flowback into the well bore or near-well bore area of the fracture.
  • [0009]
    Another embodiment of the present invention provides a method of stimulating a formation surrounding a well bore comprising the steps of: (a) hydraulically fracturing a formation through a well bore located in a substantially consolidated subterranean formation such that fractures are formed or enhanced so as to place the well bore in fluid communication with an unconsolidated or weakly consolidated zone of the formation; (b) placing proppant coated with a tackifying agent into the far-well bore area of the fracture; and, (c) placing an agent capable of controlling particulate flowback into the near-well bore area.
  • [0010]
    Other and further features and advantages of the present invention will be readily apparent to those skilled in the art upon a reading of the description of preferred embodiments which follows.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0011]
    FIG. 1 illustrates an example of longitudinal fractures propagated in a plane substantially parallel to the well bore axis.
  • [0012]
    FIG. 2 illustrates an example of transverse fractures propagated in a plane substantially orthogonal to the well bore axis.
  • [0013]
    FIG. 3 illustrates an example of puncture orientations that may be used in the methods of the present invention.
  • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • [0014]
    The present invention relates to improved methods for well stimulation and completion. More particularly, the present invention relates to methods of stimulating and completing well bores while controlling formation sand migration and proppant flowback.
  • [0015]
    Some embodiments of the present invention provide methods of stimulating hydrocarbon production and controlling particulate migration comprising the steps of (1) hydraulically fracturing a formation, (2) placing proppant coated with a tackifying agent into the far-well bore area of the fracture and then (3) placing an agent capable of controlling particulate flowback into the near-well bore area. The agent capable of controlling particulate flowback may be either proppant coated with curable resin or screen sized to control the flowback of the proppant coated with a tackifying agent in the well bore. Placing proppant coated with tackifying agent into the far-well bore area acts, inter alia, to help control the migration of formation sands. Placing either proppant coated with curable resin in the fracture near the well bore or placing a screen in the well bore acts, inter alia, to keep the proppant in place instead of producing it along with the produced fluids.
  • [0016]
    A tackifying agent is a substance that remains sticky rather than curing over time. Placing proppant coated with a tackifying agent into the far-well bore area of the fracture will help prevent formation sand from invading the near-well bore area of the fracture as the sands become trapped by the sticky character of the tackifying agent. Compounds suitable for use as a tackifying compound in the present invention comprise substantially any compound that, when in liquid form or in a solvent solution, will form a sticky, non-hardening coating upon a particulate. A particularly preferred group of tackifying compounds comprise polyamides that are liquids or in solution at the temperature of the subterranean formation such that the polyamides are, by themselves, non-hardening when present on the particulates introduced into the subterranean formation. A particularly preferred product is a condensation reaction product comprised of commercially available polyacids and a polyamine. Such commercial products include compounds such as mixtures of C36 dibasic acids containing some trimer and/or higher oligomers and also small amounts of monomer acids that are reacted with polyamines. Other polyacids include trimer acids, synthetic acids produced from fatty acids, maleic anhydride and acrylic acid and the like. Such acid compounds are commercially available from companies such as Witco Corporation, Union Camp, Chemtall, and Emery Industries. The reaction products are available from, for example, Champion Technologies, Inc. and Witco Corporation. Additional compounds which may be used as tackifying compounds include liquids and solutions of, for example, polyesters, polycarbonates and polycarbamates, natural resins such as shellac and the like. Suitable tackifying compounds are described in U.S. Pat. No. 5,853,048 issued to Weaver, et al. and U.S. Pat. No. 5,833,000 issued to Weaver, et al., the disclosures of which are herein incorporated by reference.
  • [0017]
    Once the proppant coated with tackifying agent is placed in the far-well bore area of the fracture, proppant coated with resin may be placed in the near-well bore area. Resin-coated proppant will cure and harden into a consolidated mass that is capable of allowing fluid production and yet will provide a barrier to flowback of the tackyfied proppant, the resin-coated proppant, and the formation sands.
  • [0018]
    Proppant particles used in accordance with the present invention are generally of a size such that formation particulates that may migrate with produced fluids are prevented from being produced from the subterranean zone. Any suitable proppant may be used, including graded sand, bauxite, ceramic materials, glass materials, walnut hulls, polymer beads and the like. Generally, the proppant particles have a size in the range of from about 4 to about 100 mesh, U.S. sieve series. The proppant coated with tackifying agent and placed in the far-well bore area may be the same as or different than the proppant coated with resin and placed in the near-well bore area.
  • [0019]
    Resins suitable for use in the resin slurries in the present invention include, but are not limited to, two-component epoxy-based resins, furan-based resins, phenolic-based resins, high-temperature (HT) epoxy-based resins, and phenol/phenol formaldehyde/furfuryl alcohol resins.
  • [0020]
    Selection of a suitable resin-type coating material may be affected by the temperature of the subterranean formation to which the fluid will be introduced. By way of example, for subterranean formations having a bottom hole static temperature (“BHST”) ranging from about 60° F. to about 250° F., two-component epoxy-based resins comprising a hardenable resin component and a hardening agent component containing specific hardening agents may be preferred. For subterranean formations having a BHST ranging from about 300° F. to about 600° F., a furan-based resin may be preferred. For subterranean formations having a BHST ranging from about 200° F. to about 400° F., either a phenolic-based resin or a one-component HT epoxy-based resin may be suitable. For subterranean formations having a BHST of at least about 175° F., a phenol/phenol formaldehyde/furfuryl alcohol resin also may be suitable.
  • [0021]
    One resin suitable for use in the methods of certain embodiments of the present invention is a two-component epoxy based resin comprising a hardenable resin component and a hardening agent component. The hardenable resin component is comprised of a hardenable resin and an optional solvent. The solvent may be added to the resin to reduce its viscosity for ease of handling, mixing and transferring. It is within the ability of one skilled in the art, with the benefit of this disclosure, to determine whether and how much solvent may be needed to achieve a viscosity suitable to the subterranean conditions. Factors that may affect this decision include geographic location of the well and the surrounding environmental conditions. An alternate way to reduce the viscosity of the liquid hardenable resin is to heat it. This method avoids the use of a solvent altogether, which may be desirable in some circumstances. The second component of the two-component epoxy based resin is the liquid hardening agent component, and it is comprised of a hardening agent, a silane coupling agent, a surfactant, an optional hydrolyzable ester for, inter alia, breaking gelled fracturing fluid films on the proppant particles, and an optional liquid carrier fluid for, inter alia, reducing the viscosity of the liquid hardening agent component. It is within the ability of one skilled in the art, with the benefit of this disclosure, to determine whether and how much liquid carrier fluid is needed to achieve a viscosity suitable to the subterranean conditions.
  • [0022]
    Examples of hardenable resins that can be used in the liquid hardenable resin component include, but are not limited to, organic resins such as bisphenol A-epichlorohydrin resin, polyepoxide resin, novolak resin, polyester resin, phenol-aldehyde resin, urea-aldehyde resin, furan resin, urethane resin, glycidyl ethers, and mixtures thereof. Of these, bisphenol A-epichlorohydrin resin is preferred. The resin used is included in the liquid hardenable resin component in an amount sufficient to consolidate the coated particulates. In some embodiments of the present invention, the resin used is included in the liquid hardenable resin component in the range of from about 70% to about 100% by weight of the liquid hardenable resin component.
  • [0023]
    Any solvent that is compatible with the hardenable resin and achieves the desired viscosity effect is suitable for use in the present invention. Preferred solvents are those having high flash points (most preferably about 125° F.) due to in part to safety concerns. As described above, use of a solvent in the hardenable resin composition is optional but may be desirable to reduce the viscosity of the hardenable resin component for a variety of reasons including ease of handling, mixing, and transferring. It is within the ability of one skilled in the art, with the benefit of this disclosure, to determine whether and how much solvent is needed to achieve a suitable viscosity. Solvents suitable for use in the present invention include, but are not limited to, butylglycidyl ether, dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethyl formamide, diethyleneglycol methyl ether, ethyleneglycol butyl ether, diethyleneglycol butyl ether, propylene carbonate, methanol, butyl alcohol, d'limonene, and fatty acid methyl esters.
  • [0024]
    Examples of the hardening agents that can be used in the liquid hardening agent component of the two-component epoxy based resin of the present invention include, but are not limited to, amines, aromatic amines, polyamines, aliphatic amines, cyclo-aliphatic amines, amides, polyamides, 2-ethyl-4-methyl imidazole, and 1,1,3-trichlorotrifluoroacetone. Selection of a preferred hardening agent depends, in part, on the temperature of the formation in which the hardening agent will be used. By way of example and not of limitation, in subterranean formations having a temperature from about 60° F. to about 250° F., amines and cyclo-aliphatic amines such as piperidine, triethylamine, N,N-dimethylaminopyridine, benzyldimethylamine, tris(dimethylaminomethyl) phenol, and 2-(N2N-dimethylaminomethyl)phenol are preferred with N,N-dimethylaminopyridine most preferred. In subterranean formations having higher temperatures, 4,4′-diaminodiphenyl sulfone may be a suitable hardening agent. The hardening agent used is included in the liquid hardening agent component in an amount sufficient to consolidate the coated particulates. In some embodiments of the present invention, the hardening agent used is included in the liquid hardenable resin component in the range of from about 40% to about 60% by weight of the liquid hardening agent component.
  • [0025]
    The silane coupling agent may be used, inter alia, to act as a mediator to help bond the resin to the sand surface. Examples of silane coupling agents that can be used in the liquid hardening agent component of the two-component consolidation fluids of the present invention include, but are not limited to, n-2-(aminoethyl)-3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and n-beta-(aminoethyl)-gamma-aminopropyl trimethoxysilane. The silane coupling agent used is included in the liquid hardening agent component in an amount capable of sufficiently bonding the resin to the particulate. In some embodiments of the present invention, the silane coupling agent used is included in the liquid hardenable resin component in the range of from about 0.1% to about 3% by weight of the liquid hardening agent component.
  • [0026]
    Any surfactant compatible with the liquid hardening agent may be used in the present invention. Such surfactants include, but are not limited to, an ethoxylated nonyl phenol phosphate ester, mixtures of one or more cationic surfactants and one or more non-ionic surfactants, and an alkyl phosphonate surfactant. The mixtures of one or more cationic and nonionic surfactants are described in U.S. Pat. No. 6,311,773, the relevant disclosure of which is incorporated herein by reference. A C12-C22 alkyl phosphonate surfactant is preferred. The surfactant or surfactants used are included in the liquid hardening agent component in an amount in the range of from about 2% to about 15% by weight of the liquid hardening agent component.
  • [0027]
    Use of a diluent or liquid carrier fluid in the hardenable resin composition is optional and may be used to reduce the viscosity of the hardenable resin component for ease of handling, mixing and transferring. It is within the ability of one skilled in the art, with the benefit of this disclosure, to determine whether and how much liquid carrier fluid is needed to achieve a viscosity suitable to the subterranean conditions. Any suitable carrier fluid that is compatible with the hardenable resin and achieves the desired viscosity effects is suitable for use in the present invention. The liquid carrier fluids that can be used in the liquid hardening agent component of the two-component epoxy based coating material of the present invention preferably include those having high flash points (most preferably above about 125° F.). Examples of liquid carrier fluids suitable for use in the present invention include, but are not limited to, dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethyl formamide, diethyleneglycol methyl ether, ethyleneglycol butyl ether, diethyleneglycol butyl ether, propylene carbonate, d'limonene, and fatty acid methyl esters.
  • [0028]
    Another resin suitable for use in the methods of the present invention is a furan-based resin. Suitable furan-based resins include, but are not limited to, furfuryl alcohol, a mixture furfuryl alcohol with an aldehyde, and a mixture of furan resin and phenolic resin. The furan-based resin may be combined with a solvent to control viscosity if desired. Suitable solvents for use in the furan-based consolidation fluids of the present invention include, but are not limited to 2-butoxy ethanol, butyl acetate, and furfuryl acetate.
  • [0029]
    Still another resin suitable for use in the methods of the present invention is a phenolic-based resin. Suitable phenolic-based resins include, but are not limited to, terpolymers of phenol, phenolic formaldehyde resins, and a mixture of phenolic and furan resins. The phenolic-based resin may be combined with a solvent to control viscosity if desired. Suitable solvents for use in the phenolic-based consolidation fluids of the present invention include, but are not limited to butyl acetate, butyl lactate, furfuryl acetate, and 2-butoxy ethanol.
  • [0030]
    Another resin suitable for use in the methods of the present invention is a HT epoxy-based resin. Suitable HT epoxy-based components included, but are not limited to, bisphenol A-epichlorohydrin resin, polyepoxide resin, novolac resin, polyester resin, glycidyl ethers, and mixtures thereof. The HT epoxy-based resin may be combined with a solvent to control viscosity if desired. Suitable solvents for use with the HT epoxy-based resins of the present invention are those solvents capable of substantially dissolving the HT epoxy-resin chosen for use in the consolidation fluid. Such solvents include, but are not limited to, dimethyl sulfoxide and dimethyl formamide. A co-solvent such as dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethyl formamide, diethylene glycol methyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene carbonate, d'limonene, and fatty acid methyl esters, also may be used in combination with the solvent.
  • [0031]
    Yet another resin suitable for use in the methods of the present invention is a phenol/phenol formaldehyde/furfuryl alcohol resin comprising from about 5% to about 30% phenol, from about 40% to about 70% phenol formaldehyde, from about 10 to about 40% furfuryl alcohol, from about 0.1% to about 3% of a silane coupling agent, and from about 1% to about 15% of a surfactant. In the phenol/phenol formaldehyde/furfuryl alcohol resins suitable for use in the methods of the present invention, suitable silane coupling agents include, but are not limited to, n-2-(aminoethyl)-3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and n-beta-(aminoethyl)-gamma-aminopropyl trimethoxysilane. Suitable surfactants include, but are not limited to, an ethoxylated nonyl phenol phosphate ester, mixtures of one or more cationic surfactants and one or more non-ionic surfactants, and an alkyl phosphonate surfactant.
  • [0032]
    Some embodiments of the methods of the present invention further comprise the step of puncturing the subterranean formation surrounding a horizontal well bore located in a substantially consolidated subterranean formation before the step of hydraulically fracturing the formation. The stimulation and completion methods of the present invention comprising the step of puncturing the formation are particularly well suited for use in highly deviated and horizontal well bores that penetrate substantially consolidated formations. Substantially consolidated formations help in maintaining the integrity of the well bore, and thus helping to prevent well bore collapse and excessive formation sand migration into the well bore. In puncturing the formation, unconsolidated or weakly consolidated regions located above or below the substantially consolidated well bore region may be put into fluid communication with the well bore, thus enhancing production without destabilizing the well bore. The methods of the present invention are useful in open hole well bores, well bores having a non-cemented liner, and cased and cemented well bores.
  • [0033]
    In most subterranean formation structures, consolidated and unconsolidated strata form on top of one another. Thus, the punctures are preferably performed at either the top side of the horizontal well bore (i.e. 12-o'clock or 0°), the bottom side of the horizontal well bore (i.e. 6-o'clock or 180°), or both (substantially 180° phasing). FIG. 3 illustrates these three orientations of punctures in a horizontal well bore. By way of example, where the substantially consolidated portion of the formation containing the well bore is bordered on the top by an unconsolidated region, at least the top of the horizontal well bore is preferably punctured.
  • [0034]
    Any known puncturing technique may be used in the methods of the present invention, including but not limited to, perforating and hydrajetting. Hydrajetting generally involves the use of a hydrajetting tool such as those described in U.S. Pat. Nos. 5,765,642, 5,494,103, and 5,361,856, the relevant portions of which are herein incorporated by reference. In a common hydrajetting operation, a hydrajetting tool having at least one fluid jet forming nozzle is positioned adjacent to a formation to be fractured, and fluid is then jetted through the nozzle against the formation at a pressure sufficient to form a cavity, or slot therein to fracture the formation by stagnation pressure in the cavity. Because the jetted fluids would have to flow out of the slot in a direction generally opposite to the direction of the incoming jetted fluid, they are trapped in the slot and create a relatively high stagnation pressure at the tip of a cavity. This high stagnation pressure may cause a micro-fracture to be formed that extends a short distance into the formation. That micro-fracture may be further extended by pumping a fluid into the well bore to raise the ambient fluid pressure exerted on the formation while the formation is being hydrajetted. Such a fluid in the well bore will flow into the slot and fracture produced by the fluid jet and, if introduced into the well bore at a sufficient rate and pressure, may be used to extend the fracture an additional distance from the well bore into the formation.
  • [0035]
    Therefore, the present invention is well adapted to carry out the objects and attain the ends and advantages mentioned as well as those that are inherent therein. While numerous changes may be made by those skilled in the art, such changes are encompassed within the spirit and scope of this invention as defined by the appended claims.

Claims (49)

1. A method of stimulating a formation surrounding a well bore comprising the steps of:
a. hydraulically fracturing a formation to create or enhance at least one fracture;
b. placing proppant coated with a tackifying agent into the far-well bore area of the fracture; and,
c. placing an agent capable of controlling particulate flowback into the well bore or near-well bore area of the fracture.
2. The method of claim 1 wherein the tackifying agent comprises a polyamide, a polyester, a polycarbonate, a polycarbamate, a natural resin, or a combination thereof.
3. The method of claim 1 wherein the agent capable of controlling particulate flowback comprises a screen.
4. The method of claim 3 wherein the screen is sized to control the flowback of the proppant coated with a tackifying agent.
5. The method of claim 1 wherein the agent capable of controlling particulate flowback comprises proppant coated with curable resin.
6. The method of claim 5 wherein the resin comprises a hardenable resin component comprising a hardenable resin and a hardening agent component comprising a liquid hardening agent, a silane coupling agent, and a surfactant.
7. The method of claim 5 wherein the resin composition comprises a furan-based resin comprising furfuryl alcohol, a mixture furfuryl alcohol with an aldehyde, a mixture of furan resin and phenolic resin or mixtures thereof.
8. The method of claim 7 further comprising a solvent comprising 2-butoxy ethanol, butyl acetate, furfuryl acetate, or mixtures thereof.
9. The method of claim 5 wherein the resin composition comprises a phenolic-based resin comprising terpolymer of phenol, phenolic formaldehyde resin, a mixture of phenolic and furan resin, or mixtures thereof.
10. The method of claim 9 wherein the resin composition further comprises a solvent comprising butyl acetate, butyl lactate, furfuryl acetate, 2-butoxy ethanol, or mixtures thereof.
11. The method of claim 5 wherein the resin composition comprises a HT epoxy-based resin comprising bisphenol A-epichlorohydrin resin, polyepoxide resin, novolac resin, polyester resin, glycidyl ethers, or mixtures thereof.
12. The method of claim 11 wherein the resin composition further comprises a solvent comprising dimethyl sulfoxide, dimethyl formamide, dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethyl formamide, diethylene glycol methyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene carbonate, d'limonene, fatty acid methyl esters, or mixtures thereof.
13. The method of claim 5 wherein the resin composition comprises a phenol/phenol formaldehyde/furfuryl alcohol resin comprising from about 5% to about 30% phenol, from about 40% to about 70% phenol formaldehyde, from about 10 to about 40% furfuryl alcohol, from about 0.1% to about 3% of a silane coupling agent, and from about 1% to about 15% of a surfactant.
14. A method of stimulating a formation surrounding a well bore comprising the steps of:
a. hydraulically fracturing a formation through a well bore located in a substantially consolidated subterranean formation such that fractures are formed or enhanced so as to place the well bore in fluid communication with an unconsolidated or weakly consolidated zone of the formation;
b. placing proppant coated with a tackifying agent into the far-well bore area of the fracture; and,
c. placing an agent capable of controlling particulate flowback into the near-well bore area.
15. The method of claim 14 wherein the well bore is a horizontal well bore or a highly deviated well bore.
16. The method of claim 14 wherein the tackifying agent comprises a polyamide, a polyester, a polycarbonate, a polycarbamate, a natural resin, or a combination thereof.
17. The method of claim 14 wherein the agent capable of controlling particulate flowback comprises a screen.
18. The method of claim 17 wherein the screen is sized to control the flowback of the proppant coated with a tackifying agent.
19. The method of claim 14 wherein the agent capable of controlling particulate flowback comprises proppant coated with curable resin.
20. The method of claim 19 wherein the resin comprises a hardenable resin component comprising a hardenable resin and a hardening agent component comprising a liquid hardening agent, a silane coupling agent, and a surfactant.
21. The method of claim 19 wherein the resin composition comprises a furan-based resin comprising furfuryl alcohol, a mixture furfuryl alcohol with an aldehyde, a mixture of furan resin and phenolic resin or mixtures thereof.
22. The method of claim 21 further comprising a solvent comprising 2-butoxy ethanol, butyl acetate, furfuryl acetate, or mixtures thereof.
23. The method of claim 19 wherein the resin composition comprises a phenolic-based resin comprising terpolymer of phenol, phenolic formaldehyde resin, a mixture of phenolic and furan resin, or mixtures thereof.
24. The method of claim 23 wherein the resin composition further comprises a solvent comprising butyl acetate, butyl lactate, furfuryl acetate, 2-butoxy ethanol, or mixtures thereof.
25. The method of claim 19 wherein the resin composition comprises a HT epoxy-based resin comprising bisphenol A-epichlorohydrin resin, polyepoxide resin, novolac resin, polyester resin, glycidyl ethers, or mixtures thereof.
26. The method of claim 25 wherein the resin composition further comprises a solvent comprising dimethyl sulfoxide, dimethyl formamide, dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethyl formamide, diethylene glycol methyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene carbonate, d'limonene, fatty acid methyl esters, or mixtures thereof.
27. The method of claim 19 wherein the resin composition comprises a phenol/phenol formaldehyde/furfuryl alcohol resin comprising from about 5% to about 30% phenol, from about 40% to about 70% phenol formaldehyde, from about 10 to about 40% furfuryl alcohol, from about 0.1% to about 3% of a silane coupling agent, and from about 1% to about 15% of a surfactant.
28. A method of stimulating a formation surrounding a well bore comprising the steps of:
a. hydraulically fracturing a formation to create or enhance at least one fracture;
b. placing proppant coated with a tackifying agent into the far-well bore area of the fracture; and,
c. placing an agent capable of controlling particulate flowback into the well bore or near-well bore area of the fracture.
29. The method of claim 28 wherein the tackifying agent comprises a polyamide, a polyester, a polycarbonate, a polycarbamate, a natural resin, or a combination thereof.
30. The method of claim 28 wherein the agent capable of controlling particulate flowback comprises a screen.
31. The method of claim 30 wherein the screen is sized to control the flowback of the proppant coated with a tackifying agent.
32. The method of claim 28 wherein the agent capable of controlling particulate flowback comprises proppant coated with curable resin.
33. The method of claim 32 wherein the resin comprises a hardenable resin component comprising a hardenable resin and a hardening agent component comprising a liquid hardening agent, a silane coupling agent, and a surfactant.
34. The method of claim 32 wherein the resin composition comprises a furan-based resin comprising furfuryl alcohol, a mixture furfuryl alcohol with an aldehyde, a mixture of furan resin and phenolic resin or mixtures thereof.
35. The method of claim 32 wherein the resin composition comprises a phenolic-based resin comprising terpolymer of phenol, phenolic formaldehyde resin, a mixture of phenolic and furan resin, or mixtures thereof.
36. The method of claim 32 wherein the resin composition comprises a HT epoxy-based resin comprising bisphenol A-epichlorohydrin resin, polyepoxide resin, novolac resin, polyester resin, glycidyl ethers, or mixtures thereof.
37. The method of claim 36 wherein the resin composition further comprises a solvent comprising dimethyl sulfoxide, dimethyl formamide, dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethyl formamide, diethylene glycol methyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene carbonate, d'limonene, fatty acid methyl esters, or mixtures thereof.
38. The method of claim 32 wherein the resin composition comprises a phenol/phenol formaldehyde/furfuryl alcohol resin comprising from about 5% to about 30% phenol, from about 40% to about 70% phenol formaldehyde, from about 10 to about 40% furfuryl alcohol, from about 0.1% to about 3% of a silane coupling agent, and from about 1% to about 15% of a surfactant.
39. A method of stimulating a formation surrounding a well bore comprising the steps of:
a. hydraulically fracturing a formation through a well bore located in a substantially consolidated subterranean formation such that fractures are formed or enhanced so as to place the well bore in fluid communication with an unconsolidated or weakly consolidated zone of the formation;
b. placing proppant coated with a tackifying agent into the far-well bore area of the fracture; and,
c. placing an agent capable of controlling particulate flowback into the near-well bore area.
40. The method of claim 39 wherein the tackifying agent comprises a polyamide, a polyester, a polycarbonate, a polycarbamate, a natural resin, or a combination thereof.
41. The method of claim 39 wherein the agent capable of controlling particulate flowback comprises a screen.
42. The method of claim 41 wherein the screen is sized to control the flowback of the proppant coated with a tackifying agent.
43. The method of claim 39 wherein the agent capable of controlling particulate flowback comprises proppant coated with curable resin.
44. The method of claim 43 wherein the resin comprises a hardenable resin component comprising a hardenable resin and a hardening agent component comprising a liquid hardening agent, a silane coupling agent, and a surfactant.
45. The method of claim 43 wherein the resin composition comprises a furan-based resin comprising furfuryl alcohol, a mixture furfuryl alcohol with an aldehyde, a mixture of furan resin and phenolic resin or mixtures thereof.
46. The method of claim 43 wherein the resin composition comprises a phenolic-based resin comprising terpolymer of phenol, phenolic formaldehyde resin, a mixture of phenolic and furan resin, or mixtures thereof.
47. The method of claim 43 wherein the resin composition comprises a HT epoxy-based resin comprising bisphenol A-epichlorohydrin resin, polyepoxide resin, novolac resin, polyester resin, glycidyl ethers, or mixtures thereof.
48. The method of claim 47 wherein the resin composition further comprises a solvent comprising dimethyl sulfoxide, dimethyl formamide, dipropylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethyl formamide, diethylene glycol methyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene carbonate, d'limonene, fatty acid methyl esters, or mixtures thereof.
49. The method of claim 43 wherein the resin composition comprises a phenol/phenol formaldehyde/furfuryl alcohol resin comprising from about 5% to about 30% phenol, from about 40% to about 70% phenol formaldehyde, from about 10 to about 40% furfuryl alcohol, from about 0.1% to about 3% of a silane coupling agent, and from about 1% to about 15% of a surfactant.
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